(Topic ID: 146088)

Help identifying weird bally display issue.

By Mitch

6 years ago



Topic Stats

  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 6 years ago by swampfire
  • Topic is favorited by 1 Pinsider

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#1 6 years ago

I have a bally special force. The commas in the displays that dived the scores into the thousands and millions keep looking like mini electrical charges coming out of them. it happens on any of the 4 displays and most of the time all the commas at the same time. never happens to the number. Don't know what this issue is called so it's hard to look it up. I've included pictures I hope they help.20151207_162924.jpg20151207_162952.jpg20151207_162958.jpg

#2 6 years ago

It was working fine for the last month or 2 just started in the middle of a game Saturday.

#3 6 years ago

I think I'd start by measuring the HV on the PS. Middle two pins on the 6 pin connector should be plus and minus 100VDC.

Black lead on ground.
Red lead on each of the two pins.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#4 6 years ago

Thanks Chris I'll check the voltages on the weekend. Appreciate the help.

1 week later
#5 6 years ago

can't find the connector your talking about

#6 6 years ago

Whoops. My bad. I was thinking of a different display system when I wrote that. Ignore that post.
And, that's a 6803 game. Test Point 2, under the plastic shield, should measure about 190VDC. Let's make sure it's not higher than that. If it is, the OEM trim pot on the board needs to be replaced. It's long past it's service life.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#7 6 years ago

Checked it today was reading 189. As i was checking it though i bumped some of the connectors and noticed the screws holding the power supply board were loose. Then the game stop registering the ball when it went in the drain and wouldn't start a new game.
I tightened the screws on the board and reseated all the connectors now everything is working fine and the display isnt acting up anymore. If it starts acting up again ill post here.

Thanks again chris

#8 6 years ago

If it happens again, try removing the displays one at a time to see which one is the culprit. I was kind of surprised to see (on my Skateball) that one bad display or connector can affect all of the other displays.

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